this is all i know and it may not be right but here goes----
during the depression years and the reign of hitler, cinema became increasingly popular, it gave people hope and some thing to look forward to. it was also cheap so people were able to see it often. leni riefenstahl's films including- the blue light and tiefland (although it was made after Olympia) gave people a sense of wonderment and fantasy.
when "triumph of the will" was produced the scenes including german civilians portray the way in which the aryan race was ideolised and the way they worshipped hitler, as is seen when hitler arrives in his car, standing straight with amazing posture and the crowd is going WILD.
it would have been good to watch the films in order to get a clear picture in your head of what she actually made, and if you did watch the films, just look at the picture you have in your head of it and try to pick out things such as the lack of any "non-aryan" citizens, the way hitler is portrayed as god-like etc.
hope that kinda helped, im just gonna rave on with shit. lol
good luck